package com.onlinesshop.mall.interceptor;

import com.onlinesshop.mall.pojo.User;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class UserInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //获取session中的值
        User user = (User) request.getSession().getAttribute("user");

        if (user!=null){
            return true;
        }
        request.getSession().setAttribute("errorMsg","请先登录");
        //用户不存在 就跳转到登入界面
        response.sendRedirect(request.getContextPath()+"/toLogin");
        return false;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

    }
}
